We are not able to identify what is causing the error, perhaps a variable in this client environment. Backup to local dev server and we are able to reproduce the error. Please, do you have a clue of what can cause this error on line 742? I imagine you run some sanity check that is not passing, if I can understand that I could try to trace what is sending a variable out of range, if that is the case. Or perhaps it is some patch to be applied to pro.php?
message:
Fatal error: Maximum execution time of 120 seconds exceeded in /(myserver)/apache2/htdocs/samti/plugins/system/admintools/admintools/pro.php on line 742
System:
Admin Tools Professional 2.5.5
Database Version 5.6.19-log
Database Collation utf8_general_ci
PHP Version 5.3.29
Web Server Apache
WebServer to PHP Interface apache2handler
Joomla! Version Joomla! 2.5.24 Stable [ Ember ] 25-July-2014 13:00 GMT
Joomla! Platform Version Joomla Platform 11.4.0 Stable [ Brian Kernighan ] 03-Jan-2012 00:00 GMT